Question

a 380-L tank contains steam, initially at 400 degrees celsius, 3 bar. A valve is opened, and steam flows out of the open tank at a constant mass flow rate of 0.005 kg/s. During steam removal a heater maintains the temperature within the tank constant. Determine the time, in seconds, at which 75% of the initial mass remains in the tank; also determine the specific volume, in m^3/kg and the pressure in bar in the tank at that time.